(DataFlex) Download POP3 Email using UIDLs

Demonstrates how to download POP3 email by first getting the complete set of UIDLs and then downloading email by calling FetchEmail for each UIDL. This is equivalent to calling CopyMail, except your application can process each email as it arrives instead of waiting for the entire bundle to be downloaded. Also, it's better protection against potential out-of-memory issues if your mailbox has a very large number of messages. There is no performance difference between fetching emails individually vs. calling CopyMail.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

Use ChilkatAx-win32.pkg

Procedure Test
    Handle hoMailman
    Variant vSa
    Handle hoSa
    Integer i
    Integer n
    String sUidl
    Variant vEmail
    Handle hoEmail
    Boolean iSuccess
    String sTemp1
    Boolean bTemp1

    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    // The mailman object is used for receiving (POP3) 
    // and sending (SMTP) email.
    Get Create (RefClass(cComChilkatMailMan)) To hoMailman
    If (Not(IsComObjectCreated(hoMailman))) Begin
        Send CreateComObject of hoMailman
    End

    // Set the POP3 server's hostname
    Set ComMailHost Of hoMailman To "pop.someMailServer.com"

    // Set the POP3 login/password.
    Set ComPopUsername Of hoMailman To "myLogin"
    Set ComPopPassword Of hoMailman To "myPassword"

    Get ComGetUidls Of hoMailman To vSa
    If (IsComObject(vSa)) Begin
        Get Create (RefClass(cComCkStringArray)) To hoSa
        Set pvComObject Of hoSa To vSa
    End
    Get ComLastMethodSuccess Of hoMailman To bTemp1
    If (bTemp1 <> True) Begin
        Get ComLastErrorText Of hoMailman To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Move 0 To i
    Get ComCount Of hoSa To n

    While (i < n)

        Get ComGetString Of hoSa i To sUidl

        Get ComFetchEmail Of hoMailman sUidl To vEmail
        If (IsComObject(vEmail)) Begin
            Get Create (RefClass(cComChilkatEmail)) To hoEmail
            Set pvComObject Of hoEmail To vEmail
        End
        Get ComLastMethodSuccess Of hoMailman To bTemp1
        If (bTemp1 <> True) Begin
            Get ComLastErrorText Of hoMailman To sTemp1
            Showln sTemp1
            Send Destroy of hoSa
            Procedure_Return
        End

        Get ComFrom Of hoEmail To sTemp1
        Showln "From: " sTemp1
        Get ComSubject Of hoEmail To sTemp1
        Showln "Subject: " sTemp1
        Send Destroy of hoEmail

        Move (i + 1) To i
    Loop

    Send Destroy of hoSa

    Get ComPop3EndSession Of hoMailman To iSuccess


End_Procedure